35
Condition Possible cause Correction
Poor starting
(Hard starting)
6. Broken or slipped valve timing belt
7. Poor valve seating
8. Wrong kind of engine oil
9. Burnt valves
10. Sticky valve stem
Replace
Repair or replace
Replace
Replace
Correct or replace valve
and guide
Not enough power Inadequate compression
1. Improper valve clearance
2. Valves not seating tightly
3. Valve stems tending to seize
4. Broken or weakened valve spring
5. Piston rings seized in grooves, or broken
6. Worn pistons, rings or cylinders
7. Leaky cylinder head gasket
Improperly timed ignition
1. Defective spark plug
Fuel system out of order
1. Defective fuel pump
2. Clogged fuel filter
3. Clogged fuel pipe
4. Clogged fuel tank outlet
5. Loose joint in fuel system
6. Old or dirty fuel
Abnormal condition in air intake system
1. Air cleaner dirty and clogged
Overheating tendency of engine
1. (Refer to the section entitled “over–
heating.”)
Others
1. Dragging brakes
2. Slipping clutch
3. Slippling automatic transmission
Adjust
Repair
Replace
Replace
Replace
Replace worn parts and
rebore as necessary
Replace
Adjust gap or replace
Repair or replace
Replace
Clean or replace
Clean
Retighten
Replace fuel
Clean or replace
Repair or replace
Adjust or replace
Repair or replace
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